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Showing 141 - 160 of 596 results
  • AircraftEngine Particulate Matter Emissions From Conventional and Sustainable Aviation Fuel Combustion Comparison of Measurement Techniques for Mass Number and Size
    Aircraft-Engine Particulate Matter Emissions From Conventional and Sustainable Aviation Fuel Combustion: Comparison of Measurement Techniques for Mass, Number, and Size
    Corbin, Joel C ;
    Schripp, Tobias
    2022-05-01 | PDF
    Sustainable aviation fuels (SAFs) have different compositions compared to conventional petroleum jet fuels, particularly in terms of fuel sulfur and hydrocarbon content. These differences may change the amount and physicochemical properties of volatile and non-volatile particulate matter (nvPM) emitted by aircraft engines. In this study, we evaluat ...
  • Dynamics and Bifurcations of Laminar Annular Swirling and NonSwirling Jets
    Dynamics and Bifurcations of Laminar Annular Swirling and Non-Swirling Jets
    Douglas, Christopher M ;
    Emerson, Benjamin
    2022-05-01 | PDF
    This paper presents bifurcation analyses characterising the nonlinear dynamics of fully developed laminar annular jets with respect to the centrebody diameter d, Reynolds number Re, and swirl ratio S. Similar flows appear in numerous applications and feature a vibrant range of topological and dynamical characteristics associated with phenomena incl ...
  • Sensitivities of Aircraft Acoustic Metrics to Engine Design Variables for Multidisciplinary Optimization
    Sensitivities of Aircraft Acoustic Metrics to Engine Design Variables for Multidisciplinary Optimization
    Voet, Laurens J. A. ;
    Prakash, Prashanth
    2022-05-01 | PDF
    Aircraft environmental performance metrics including fuel burn, takeoff and landing noise, and gaseous emissions are increasingly driving the design and optimization of modern aircraft engines. Gradient-based methods can significantly reduce the computational resources required during their multidisciplinary optimizations. However, current state-of ...
  • A DataDriven Approach to Departure and Arrival Noise Abatement Flight Procedure Development
    A Data-Driven Approach to Departure and Arrival Noise Abatement Flight Procedure Development
    Mahseredjian, Ara ;
    Huynh, Jacqueline L.
    2022-05-01 | PDF
    An aircraft noise modeling framework is presented and used to perform a data-driven exploration of factors correlating with measured aircraft community noise and a model-based validation of the variables found to have the greatest noise impact. Aggregate departure and arrival noise and flight procedures were examined so that factors correlating wit ...
  • Methodology for Quantifying the Impact of Repurposing Existing Manufacturing Facilities Case Study Using Pulp and Paper Facilities for Sustainable Aviation Fuel Production
    Methodology for Quantifying the Impact of Repurposing Existing Manufacturing Facilities: Case Study Using Pulp and Paper Facilities for Sustainable Aviation Fuel Production
    Brandt, Kristin ;
    Camenzind, Dane
    2022-04-01 | PDF
    Sustainable aviation fuel (SAF) is vital for the reduction of the environmental impact of the aviation industry while decreasing the dependence of the USA on foreign petroleum fuels. To date, SAF, especially from cellulosic feedstocks, have struggled to overcome two barriers: (1) meeting price parity with their petroleum counterparts and (2) the la ...
  • Touch User Interfaces in Air Traffic Control Final Guidelines Report with Recommended Updates for the FAA Human Factors Design Standard HFDS FAA HFSTD001B
    Touch User Interfaces in Air Traffic Control: Final Guidelines Report with Recommended Updates for the FAA Human Factors Design Standard (HFDS) [FAA HF-STD-001B]
    Dodd, Sonia ;
    Lubold, Nichola
    2022-03-16 | PDF
    The objective of this effort is to identify human factors issues and generate guidelines and recommendations for updating the FAA Human Factors Design Standard (HFDS) [FAA HF-STD-001B], touch based user-interface (TUI) section. Technical tasks consist of conducting a literature review, a gap analysis with recommendations for future research and a g ...
  • Advanced Fuel Property Data Platform Overview and Potential Applications
    Advanced Fuel Property Data Platform: Overview and Potential Applications
    Blakey, Simon ;
    Rauch, Bastian
    2022-03-01 | PDF
    This report outlines the establishment of distributed databases for management and integration of current and future aviation fuels. Aviation fuel property and performance data has been gathered for many years in public and company specific fuel surveys. These surveys are suitable for use as overall quality control information and for monitoring ch ...
  • Cumulative Impact of Federal and State Policy on Minimum Selling Price of Sustainable Aviation Fuel
    Cumulative Impact of Federal and State Policy on Minimum Selling Price of Sustainable Aviation Fuel
    Brandt, Kristin ;
    Martinez-Valencia, Lina
    2022-03-01 | PDF
    With jet fuel consumption projected to more than double by 2050, dramatic expansion of sustainable aviation fuel (SAF) use will be essential to meeting the aviation industry goal of achieving carbon neutrality in the same time frame. However, to date, the SAF price has, in part, been responsible for the lack of widespread adoption signaling the nee ...
  • Impacts of a NearFuture Supersonic Aircraft Fleet on Atmospheric Composition and Climate
    Impacts of a Near-Future Supersonic Aircraft Fleet on Atmospheric Composition and Climate
    Eastham, Sebastian D ;
    Fritz, Thibaud M
    2022-02-01 | PDF
    Supersonic aircraft will have environmental impacts distinct from those of subsonic aviation, and are once again being developed and bought. Assessments of supersonic aircraft emissions impacts over the last decade have focused on the ozone and climate impacts of nitrogen oxides and water vapor, but assumed zero-sulfur fuel, zero black carbon emiss ...
  • Air Carrier Training Recommendations to Address Limitations of Pilot Procedures during Unexpected Events in NextGen Operations Task 3 Pilot Needs Analysis
    Air Carrier Training Recommendations to Address Limitations of Pilot Procedures during Unexpected Events in NextGen Operations. Task 3: Pilot Needs Analysis
    Cruit, Jessica ;
    Kochan, Janeen A
    2022-02-01 | PDF
    We present the results of a Subject Matter Expert knowledge elicitation study conducted with US Air Carrier pilots, instructor pilots, and evaluators through a semi-structured interview process. The goal of the study was to support or refute the body of research on pilot performance in responding to unexpected events presented in Task 2 from this r ...
  • Relevant Research Assessment Concerning Pilot Response to Unexpected Events Task 2 Relevant Research Assessment
    Relevant Research Assessment Concerning Pilot Response to Unexpected Events. Task 2: Relevant Research Assessment
    Hancock, P. A. ;
    Cruit, Jessica
    2022-02-01 | PDF
    This report provides a review of the existent information pertinent to the response to novel, unexpected, surprising, and/or unanticipated events, primarily focused on the context of aviation. The primary effort here is to identify ways in which to mitigate the brittleness of accepted traditional forms of response and to foster both adaptive and re ...
  • Aerosol Formation Pathways from Aviation Emissions
    Aerosol Formation Pathways from Aviation Emissions
    Prashanth, Prakash ;
    Eastham, Sebastian D
    2022-02-01 | PDF
    Aviation emissions are responsible for an estimated 24,000 premature mortalities annually and 3.5% of anthropogenic radiative forcing (RF). Emissions of nitrogen and sulfur oxides (NOx and SOx) contribute to these impacts. However, the relative contributions and mechanisms linking these emissions to formation and impacts of secondary aerosols (as o ...
  • HumanintheLoop Method to Test the Effectiveness of Training Pilot Responses to Unexpected Events Task 4 Training Development Plan
    Human-in-the-Loop Method to Test the Effectiveness of Training Pilot Responses to Unexpected Events. Task 4: Training Development Plan
    Cruit, Jessica ;
    Kochan, Janeen A
    2022-02-01 | PDF
    This report provides a primer as to how to conduct human-in-the-loop (HITL) research in which pilots’ responses to unexpected events can be explored for potential mitigations through training. The results of this effort conclude the following findings and recommendations: Identification of key independent and dependent variables for assessing pilot ...
  • Sociodemographic Patterns of Exposure to Civil Aircraft Noise in the United States
    Sociodemographic Patterns of Exposure to Civil Aircraft Noise in the United States
    Simon, Matthew C, ;
    Hart, Jaime E
    2022-02-01 | PDF
    Background: Communities with lower socioeconomic status and higher prevalence of racial/ethnic minority populations are often more exposed to environmental pollutants. Although studies have shown associations between aircraft noise and property values and various health outcomes, little is known about how aircraft noise exposures are socio-demograp ...
  • Social Science Applications in Sustainable Aviation Biofuels Research Opportunities Challenges and Advancements
    Social Science Applications in Sustainable Aviation Biofuels Research: Opportunities, Challenges, and Advancements
    Anderson, Brian J ;
    Mueller, Daniel W
    2022-01-01 | PDF
    Social science has an important role in aviation biofuels research, yet social science methods and approaches tend to be underdeveloped and under-utilized in the broader aviation biofuels literature and biofuels overall. Over the last 5 years, social science approaches in aviation biofuels research, particularly site-selection, have made several ad ...
  • Oilseed Cover Crops for Sustainable Aviation Fuels Production and Reduction in Greenhouse Gas Emissions Through Land Use Savings
    Oilseed Cover Crops for Sustainable Aviation Fuels Production and Reduction in Greenhouse Gas Emissions Through Land Use Savings
    Taheripour, Farzad ;
    Sajedinia, Ehsanreza
    2022-01-01 | PDF
    Induced Land Use Changes (ILUCs) can decrease the environmental benefits of Sustainable Aviation Fuels (SAFs) if produced from traditional food crops. The development of oilseed cover crops can eliminate the side effect of ILUCs for biofuel production because they come in rotation with the major crops with some savings in demand for new cropland. T ...
  • Searching for Culture in Cultural Capital The Case for a Mixed Methods Approach to Production Facility Siting
    Searching for Culture in “Cultural Capital”: The Case for a Mixed Methods Approach to Production Facility Siting
    Boglioli, Marc ;
    Mueller, Daniel W
    2022-01-01 | PDF
    Site selection modeling receives much attention in the aviation biofuels literature to ensure sustainability of the aviation biofuel supply chain. These models seek to reflect the multitude of factors and conditions necessary for supply chain success. Social factors impacting that success have received increasingly greater attention but are often e ...
  • Threshold Sooting Index of Sustainable Aviation Fuel Candidates From Composition Input Alone Progress Toward Uncertainty Quantification
    Threshold Sooting Index of Sustainable Aviation Fuel Candidates From Composition Input Alone: Progress Toward Uncertainty Quantification
    Boehm, Randall C. ;
    Yang, Zhibin
    2022-01-01 | PDF
    A quantitative structure–property relationship model has been developed to predict the threshold sooting index (TSI) of arbitrary mixtures of aliphatic and aromatic hydrocarbons of known composition. The model employs contributions from eight molecular fragments plus a global shift and a penalty factor for naphthenic compounds. For each coefficient ...
  • ToxFlo Description and Data Dictionary
    ToxFlo Description and Data Dictionary
    United States. Department of Transportation. Federal Aviation Administration
    2022-01-01 | PDF
    ToxFlo is a system developed using Microsoft Access, suited to the needs of BSRB Forensic Sciences. To accomplish the Lab’s mission of conducting toxicological analyses, the system allows entry and security of demographics and analytical information related to investigations into accidents involving primarily aircraft, but also includes accidents f ...
  • Perspectives on Fully Synthesized Sustainable Aviation Fuels Direction and Opportunities
    Perspectives on Fully Synthesized Sustainable Aviation Fuels: Direction and Opportunities
    Kramer, Stephen ;
    Andac, Gurhan
    2022-01-01 | PDF
    The aviation sector seeks to reduce greenhouse gas (GHG) emissions, with manufacturers and airlines announcing “zero-emission” goals and plans. Reduced carbon aviation fuels are central to meeting these goals. However, current and near-term aircraft, which will remain flying for decades, are designed around the combustion of petroleum-based aviatio ...
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